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Efficacy of Pyrithiobac and Bromoxynil Applied with Low-Volume Spray Systems

Published online by Cambridge University Press:  12 June 2017

Joyce A. Tredaway ,
Michael G. Patterson  and
Glen R. Wehtje
Joyce A. Tredaway
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
Michael G. Patterson
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
Glen R. Wehtje
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
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Abstract

Field experiments were conducted in 1994 and 1995 to determine if the sodium salt of pyrithiobac or bromoxynil applied in a low-volume, air-assist spray system controlled entireleaf morningglory, pitted morningglory, and smallflower morningglory as well as treatments applied with a conventional hydraulic fan spraying system, and to determine if herbicide rates could be reduced when using the low-volume spraying system. Pyrithiobac at 0.035 and 0.071 kg ai/ha and bromoxynil at 0.56 and 1.12 kg ai/ha were applied alone and in combination with DSMA at 1.7 kg ai/ha or MSMA at 1.7 kg ai/ha. Spraying systems were calibrated to deliver 26 L/ha and 140 L/ha for the low-volume and conventional systems, respectively. No significant differences in control were noted between low-volume and conventional spray systems when herbicides were applied at the suggested use rates of 0.071 and 1.12 kg ai/ha for pyrithiobac and bromoxynil, respectively. Morningglory control was reduced when pyrithiobac and bromoxynil were applied at one-half the suggested use rate regardless of the spraying systems. Bromoxynil alone generally controlled pitted and entireleaf morningglory better than pyrithiobac alone regardless of rate and application method. However, pyrithiobac generally provided better control of smallflower morningglory than bromoxynil. Adding MSMA or DSMA to bromoxynil and pyrithiobac increased control of both weed species.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitrileDSMA, disodium salt of methylarsonic acidMSMA, monosodium salt of methylarsonic acidpyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic acidentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray. # IPOHGpitted morningglory, Ipomoea lacunosa L. # IPOLAsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. # IAQTAAir-assistspray systemdrifttransgenic cottonDSMAMSMAIPOLAIPOHGIAQTADAT, days after treatmentgpa, gallous per acreLV, low volumePOST, postemerenceULV, ultra low volume
Type
Research
Information
Weed Technology , Volume 11 , Issue 4 , December 1997 , pp. 725 - 730
Copyright
Copyright © 1997 by the Weed Science Society of America 

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